PHYLUM ARTHROPODA 



217 



and exopodite having the form of broad flat plates ; in the 

 natural position of the parts they lie one on each side of the 

 telson, forming with it a large five-lobed tail-fin ; they are 



O.CofJulafopy Organs lO.Swimming FooC 



ll.Uropod 3. 



FIG. 124. Typical appendages of Astacus. en. 1-5, podomeres of endopodite; 

 ep, epipodite; ex, exopodite; A. flagella; g, gill; pr. i, pr. 2, podomeres of 

 protopodite; /-j, podomeres of axis of antennule. (After Huxley.) 



therefore conveniently called uropods or tail-feet. The telson 

 itself bears no appendages. 



